环糊精多孔聚合物对水中染料分子的吸附性能及主客效应

环糊精能够与多种有机污染物形成主-客体包合物,对去除水中种类复杂的染料分子具有独特的优势.利用刚性交联剂交联制备出了环糊精多孔聚合物(P-CDP),借助FT-IR、XPS、SEM和BET等技术对P-CDP结构进行表征,采用等温吸附和动力学吸附实验研究P-CDP对染料的吸附过程,并通过竞争实验探究P-CDP对水中染料分子...

Adsorption Properties and Host-guest Effects of Porous Cyclodextrin Polymers for Dye Molecules in Water

Cyclodextrin can form host-guest inclusion complexes with a variety of organic pollutants and has unique advantages in removing complex dye molecules from water. In this study, a porous cyclodextrin polymer (P-CDP) was prepared using a rigid crosslinking agent, and the structure of the P-CDP was characterized by FT-IR, XPS, SEM, BET, and other technologies. The P-CDP was studied using isothermal adsorption and kinetic adsorption experiments. The inclusion adsorption performance and host-guest effect of the P-CDP for dye molecules in water were studied using competitive experiments. The characterization results showed that the P-CDP had strong thermal stability. It had a microporous structure with a specific surface area of 108.745 m²·g^-1. The Langmuir model and the pseudo-second-order kinetic model had a higher fitting degree for the adsorption process. The results of the competition experiments showed that the electrostatic effect was stronger than the host-guest effect in the adsorption process. Pollutants whose molecular configurations were highly matched with the cyclodextrin cavity could form inclusion complexes with high molecular stability. Contaminants with strong hydrophobicity were more likely to be encapsulated in the cyclodextrin cavity. After the P-CDP adsorbed the dyes, the removal efficiency after the fifth cycle of elution and regeneration remained above 80%. This study showed that P-CDP has potential application value in the treatment of dye wastewater.